From 115152ce103ddaf9ae4bc43d362d892731de8307 Mon Sep 17 00:00:00 2001
From: ulatekh <ulatekh@yahoo.com>
Date: Mon, 30 Aug 2021 16:10:43 -0700
Subject: KWSys: SystemTools: Ensure Windows Vista APIs are available before
 using them

Backport KWSys commit `4ef5b1063` (SystemTools: Ensure Windows Vista
APIs are available before using them, 2021-08-30) to the CMake 3.21
release branch.
---
 Source/kwsys/SystemTools.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index 7c26974..f610a70 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -14,6 +14,10 @@
 #  endif
 #endif
 
+#if defined(_WIN32) && !defined(_WIN32_WINNT)
+#  define _WIN32_WINNT _WIN32_WINNT_VISTA
+#endif
+
 #include "kwsysPrivate.h"
 #include KWSYS_HEADER(RegularExpression.hxx)
 #include KWSYS_HEADER(SystemTools.hxx)
-- 
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